Powering Tomorrow: Sustainable Bio butanol for Next-Generation Transportation Fuels

Abstract

The increasing depletion of fossil fuel resources and growing environmental concerns have accelerated the demand for sustainable alternative fuels. Biobutanol has emerged as a promising renewable biofuel because of its higher energy density, lower hygroscopicity, reduced volatility, and superior compatibility with existing fuel infrastructure compared to bioethanol. This study focuses on the production and evaluation of biobutanol as an alternative fuel for petrol and diesel engines. Biobutanol is produced through Acetone–Butanol–Ethanol (ABE) fermentation using Clostridium species with renewable feedstocks such as sugarcane, molasses, corn, and lignocellulosic agricultural residues. The production process includes biomass pretreatment, enzymatic hydrolysis, anaerobic fermentation, and downstream purification to obtain fuel-grade biobutanol. The fuel properties of biobutanol, including calorific value, octane number, flash point, viscosity, and density, were evaluated and compared with conventional petrol and diesel. Experimental studies indicate that biobutanol blends provide satisfactory engine performance with improved combustion efficiency and reduced emissions of carbon monoxide, hydrocarbons, and particulate matter while requiring minimal engine modifications. Although challenges such as higher production cost, lower fermentation yield, and product recovery remain, recent advances in microbial engineering and process optimization have significantly improved production efficiency. Overall, biobutanol demonstrates excellent potential as a sustainable transportation fuel capable of reducing greenhouse gas emissions, improving energy security, and decreasing dependence on fossil fuels. Its production from renewable biomass supports the development of environmentally friendly and economically viable energy systems for future automotive applications.